The advise that you were so quick to discard should apply to OpenBSD too. Whatever options you use in your fstab applies on a filesystem level and won't affect your dd test unless you operate on the filesystem instead of the block device.
Anyway, just for your reference, this is what I get in my net5501 with a 8Gb Sandisk CF with a "30Mb/s" label. And yes, this is Linux. # dd if=/dev/sda of=/dev/null bs=1M count=50 50+0 records in 50+0 records out 52428800 bytes (52 MB) copied, 1.88587 s, 27.8 MB/s # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 360 MB in 2.01 seconds = 179.08 MB/sec Timing buffered disk reads: 80 MB in 3.03 seconds = 26.40 MB/sec On Thu, Jun 28, 2012 at 8:05 AM, Guy Hunter <[email protected]> wrote: > Please don't take this the wrong way, but do you actually use OpenBSD? I'm > looking for help with OpenBSD not GNU/Linux. The noatime/softdeps options > are standard OpenBSD disk optimization's used in /etc/fstab. Thanks anyway. > > Currently I get around 13M/s reads, 20M/s writes. This seems extremely slow > to me especially for a device that is SATA 3Gb/s. > > Anyone else? > > On Thu, Jun 28, 2012 at 8:53 AM, loppefaaret <[email protected]> wrote: >> >> noattime ? softdeps ? are u working inside the filesystem ? try working >> directly on the device instead ? >> >> although working directly on the devices, writing anything will render the >> data unusable... if ur looking for read perfomance testing, try hdparm -tT >> /dev/sd# or whatever Obsd uses >> >> >> On Thu, Jun 28, 2012 at 12:45 AM, Guy Hunter <[email protected]> wrote: >>> >>> Hi all, >>> >>> I've been testing OpenBSD 5.1/i386 on both a net5501 and a net6501 and I >>> can't get more than 20MB/s transfer speeds on either device (using dd as a >>> benchmark). >>> >>> Both devices have SSDs, the net5501 has an Intel 330 while the net6501 >>> has a SanDisk Extreme. I'm using noatime and softdeps on each machine. >>> >>> I'm wondering if there is something else I can tweak to get better speed >>> of the drives, or is this to be expected? >>> >>> Thanks in advance, >>> >>> -- >>> Guy >>> >>> _______________________________________________ >>> Soekris-tech mailing list >>> [email protected] >>> http://lists.soekris.com/mailman/listinfo/soekris-tech >>> >> >> >> _______________________________________________ >> Soekris-tech mailing list >> [email protected] >> http://lists.soekris.com/mailman/listinfo/soekris-tech >> > > > > -- > Guy Hunter > Reteq > Ph. 1300 550 571 > > _______________________________________________ > Soekris-tech mailing list > [email protected] > http://lists.soekris.com/mailman/listinfo/soekris-tech > _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
